Pump.



A. A* BOWSER.

PUMP.

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` PUMP.

APPLICATION FILED NOV. 4| 1912.

Patented May 11, 1915.

4 SHEETS-SHEET 4.

IW.- I H Man/.5. .EQU/ef iaaaeei.

, 'Um'rnn STATES; Baur oFrIcE.

ALLEN A. BOWSER, F FORT WAYNE, INDIANA; ASSIGNOR T S. F. BOWSER du COMPANY,

INCORPORATED, OF FORT WAYNE, INDIANA.

Be it known that I, ALLEN A. Bowser, a' citizen of the United States, residing at Fort Wayne, inthe county ofAllen and State of Indiana, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

This invention relates to pumps, and more particularly to flow-back release mechanism accomplishmentof other new and useful objects, as will appear, the invention consists in featuresof novelty in the construction,

combination and arrangement of the severalv `yparts generally shown in the accompanying drawings and described in the specification, but more particularly pointed out in the' appended claims. 1 s In the drawings Figure 1 is a side elevation'of the operating mechanism for a' pump .of the class described, constructed in accor-dance withr the principles of my invention; Fi 2 is a detail sectional View of an adjustab e stop; Figi?)1 is a view partly in elevation andv partly in section" of a pump cylinder provided 'with now-back release mechanism; Fig. 4 is .a perspective' viewlof lone of the parts'""Fig.-5"is`a erspective view of another of tliefpa'rtsg ig; 6 is a plan' view showing the quantity registering mech'- anism; Fig. 7is alsecti'ona'l view taken along line 7--7 of Fig. 3; Fig. 8`isa side elevationv of a modified'form ofthe operating mechanismv; Fig. 9 is a detailview of some of the parts shown in Fig. 8. f i Y,

In pumps which are employed for the purpose of discharging inflammable or combustible fluid, it is desirable to provide means for permitting the fluid which may be contained in the pump cylinderat any time to return `to a reservoir from which the fluid is pumped. This is particularly true of pumps for discharging gasolene, oil and the like, where the reservoir from which the fluid is pumped is located at a distance from thel pump itself for' the purposes of safety and for meeting with the fire insur- Specication of Letters Patent.

- applicati@ mea November 4, 1912. serial No'. 729,251'.

ance requirements. The present invention is particularly designed and intended to accomplish this result.

Referring now more particularly to the drawings and in the present exemplification of the invention, a pump casing 10 of any desired or suitable construction is provided with a piston, reciprocable therein and having alpiston rod 12 secured thereto and movable through a cap member 13 at one end of the cylinder. V

The pump is of the type in which the piston is provided with a valve to admit the fluid pumped from one side of the piston through the piston during one stroke thereof to discharge the liquid during the opposite stroke. .For accomplishing this result the piston 11 is provided with packing rings 14 and packing members l5 of any desired or suitable construction and is formed with an openingl preferably adjacent to the center thereof having a'guide 17 thereon with the upper edges 18 of the opening forming a valve seat for a, valve 19, lthe stem 20 of which extends through the guide 17, the valve being freely movable and operative to open and close the'passage through the Piston. The piston 11 is also provided with a yokel 21 which efxte'nds upwardly over the opening 16 therein and forms a means of attachment for the end of the pistonrod 12. Inthe preferred construction the end of the piston rod 12 extendsl through the yoke 21, and is provided with a lock nut 43. Abufer 44 is also disposed at the end of the piston rod to4 limit the upward movement of the valve 19 with respect to the piston.

At the end of the cylinder 10 opposite the i cap member 13 is a .chambered base member 22.having a laterally extendingA portion 23 which has an opening 24 therein. This opening '24 is an inlet openin' for the fluid pumped andis disposed at t e under side of the base member 22. Opposite the opening 24 and in the projecting portion 23 is yan internally threaded opening 25,r which is adapted to be closed by means of a threaded cap member 26. Disposed within the extending portion 23 adjacent to the opening 24 is a valve seat 27 and mounted in the opening 25 in a suitable manner is a guide 28. This guide may be held in position by means ofa shoulder 29 extending around the inside of the opening 25, vthe guide 28 being of a diameter to engage the shoulder and to be held in place by the cap 26 when it is threaded into position. The valve 30 having a valve stem 31 which extends through the guide 28 is adapted to be seated upon the valve seat 27 and the valve stem is provided with a shoulder 32 intermediate of the ends thereof.`

Disposed in the chamber in the base member 22 is a support 33 in which a lever 34 is pivotally mounted. This lever is provided at one end with a knob 35 (see Fig. 4i) and adjacent to the other end on both sides of the lever with projections 36. These projections 36 are formed with shoulders 37. The lever 34 is provided with an opening 38 adjacent the end upon which the projections 36 are located for a pivotally mounted dog 39. This dog as shown more clearly in Fig. 5 is preferably formed with perforated bifurcations having shoulders therein extending in one direction and an engaging portion 41 extending in the opposite direction. When this dog is in position Aat the end of the lever 34 thevshoulders 40 of the dog are adapted to engage the shoulders 37 on the projections 36 of the lever to prevent the movement of the dog beyond a certain position with `respect to the lever in one direction but permitting a limited rotative movement in the other direction. The engaging portion 41 of the dog is adapted to extend beneath the shoulder 32 on the valve stem 31 of the valve 3() so that a downward movement of the lever 34 at the end upon which of course,'that the Valve 30 is free to act in accordance with the movement of the piston 11. In order to maintain the lever 34 and the dog 39 in position so that the valve 30 will not be normally engaged thereby, a spring E42 is disposed between the knob 35 and the support 33' which tends to press this end of the lever 34 upward.

In order to operate the lever 34 to raise the valve 30, the piston 11 is permitted to descend slowly below its normalposition at the end of its stroke whereupon the end of the valve stem 2O engages thel knob 35 causing the valve 19 to be raised until it strikes the buffer 44 which causes the lever 3 4 to be depressed against the action of the spring 42, whereupon the valve 30 will be raised from its seat 27. It will be understood that during the normal operation of the pump the piston does not descend to al point where the end of the valve stem engages the knob of the lever 34. In order to effect the operation of the lever .34 the piston rod 12 is provided with means yfor permitting an additional movement thereof at the end of the stroke. A suitable means for permitting the additional movement .of the piston rod 12 at the lower end of its stroke is illustrated by Figs. 1 and 6. A rack 45 is secured to the piston rod 12 preferably at the upper end thereof and is formed with a projection 46 preferably disposed at the bottom ofthe rack. This rack is made adjustable upon the rod by providing it with collars 47 at the ends thereof which surroundthe rod. One of the collars is provided with an adjustable screw 48 and the end of the rod 12 being provided with a cap nut 49. A pinion 50 mounted upon a shaft 51 meshes with the teeth of the rack and a gear 52 is mounted upon the same shaft 51, which meshes with a pinion 53. This pinion 53 is securedto a shaft 54 to which a hand crank 55 is also secured. The rotation of the crank 55 causes the movement of the rack 45 in the wellknown manner. In order to limit the movement of the rack so that any pre-determined amount of liquid may be pumped at a stroke 8b a threaded rod 56 having 'a longitudinally extending keyway 57 is mounted for free rotation about an axis parallel with the piston rod 12 and is-provided with a number of adjustable stops 58, which are adapted to bel moved into position to engage the projection 46 of the rack 45 during its upward movement. These stops each preferably comprise a recessed member 59 (see Fig. 2) with openings 60 at right angles to the recess and having a key-way 61 in which a key 62 is disposed, the key having a projecting portion A63 which extends along the key-way 57 of the rod 56. An internally threaded member 64 with external notches 65 is disposed in the recess of the member 59 and is thread- Ved upon the rod 56', so that the rotation of the member 64 causes the longitudinal movement ofthe member 59, without rotating the latter. In order to maintain the threaded member 64 in any adjusted position the member 59 is provided with one or more perforations through which a pin 66 may be inserted in such a position as to engage in one of the notches 65 of the member. To 140 limit the normal movement of the rack 45 in the desired direction a stop device 67 is provided which is mounted upon the rod 56 and is preferably constructed and operated in the same manner as the stops'58, but is 115 provided with an engaging portion 68, of greater angular width than the engaging portions of the stops 58, as shown more clearly in Fig. 6.

The pump is preferably constructed with a tubular member 69 extending from the cap member 13 and supporting a frame 70, the frame having an upwardly extending portion 78, by which the operating mechanism is supported. One end of the rod 56 125 70 isa dial 73 which indicates several angular positions to which the arm or pointer 72 may be moved to position the rod 56. The stops 58 are arranged upon the rod 56 at different angular positions than the arm or pointer whereby the rotation-of the rod 56 by means of the pointer 72 will position one of the stops 58 to engage the projection A4:6 of the rack 45 during its upward movement. The stop 67 limits the normal movement of the rack in the other direction as previously explained. When it is desired to operate the releasing mechanism at the bottom of the casing 10, the stop 67 must first be rotated by-means of the arm or pointer-72 so that the engaging surface 68 of the stop 67 will be cleared of the rack 45. To accomplish this result the pointer l 72 must be moved to the position marked Open on the dial or plate 73. When the stop (57 has been moved to this position the rack 45 and the piston rod 1 2 may be dropped or forced downwardly a slight distance sulicient to engage the end of the valve stem 20 (see Fig. 3)' with the knob 35 of the lever 34. Under these circumstances the valves 30 and 19 will be raised from their valve seats which will permit any liquid which happens to be in the pump casing 10 or in the chambered member 22 to flow downwardly through the inlet opening 2l and thence to the supply tank or reservoir If desired the discharge or tubular member 69 which is connected to the top of the pump casing may be connected with a discharge pipe 7l which may be provided with a reservoir connection or stand pipe 75.

A modified form of the operating mechanism is illustrated by Figs. 8 and 9, comprising a rack and operating mechanism similar to that already described but differing in the construction of the specific mechanism. A bar 7G is rotatably mounted in the pump frame in proximity to the rack thereof and is provided with an arm or pointer 72 similar to that already described. A number of stops 77 are positioned upon the bar 76 and are each provided with an adjusting screw 78. These stops vare rotated by means of the arm 72 into a position to engage the projection 46 of the rack 4:5 as previously explained. Instead of providing a stop at the bottom of the rack, the top of the pump frame 78 is provided with a forked member 79 which extends on both sides of the rack 45 as shown in Fig. 9. The top of the piston rod 12 is provided with-a nut 80 having an enlarged flange 81 which is adapted to engage the forked inember 79 to prevent the rack and piston rod from moving downwardly a distance equal to thehheight of forked member 79. This member 79 is provided with a slotted portion 82 through the slot of which an adjusting nut 83 extends into a fixed portion of the support to hold the forked member 79 releasable in position.l When the member 79 is withdrawn so that it is not engaged by the flange 80 the piston rod 12 will be permitted to drop an additional distance which issuflicient to operate the flow-back releasing mechanism as previously set forth.

Vhile I have thus described the preferred embodiment of my invention it is evident that those skilled in the arts to which this relates may make various changes in the construction, combination and arrangement of the several parts Without departing from the spirit and scope of the invention.

What I claim is:

1. The combination with a pump having a reciprocable piston, of an admission valve movable parallel with the piston but spaced laterally from the pump at the bottom, and a. normally inoperative lever engaging both the valve and piston to open the valve by a movement of the piston in one direction.

2. The combination'with a pump having a reciprocable piston, of an admission valve movable parallel therewith but spaced laterally from the pump at the bottom, and a lever normally inoperative but adapted to engage both the valve and the piston when the piston 'is moved an additional distance in one direction, for opening the valve.

3l In a pump, the combination with a reciprocable valved piston, of an admission valve at the bottom of the pump movable parallel with the piston but spaced therefrom, and a lever normally inoperative disposed at the bottom of the pump and adapted to be interposed between the valvein the piston and the other valve engaging both valves when the piston is moved an additional distancein the downward direction.

4. In a pump, the combination with a reciprocable valved piston having an ordinary length of travel and capable of movement an additional distance in one direction, a movable stop to govern the additional movement of the piston, an admission'valve at the bottom of the pump movable parallel with the piston but spaced laterally therefrom, a lever of the first order normally inoperative but adapted to be engaged by the piston valve when the piston is moved an additional distance to openboth the piston valve and the admission valve to permit a back flow of fluid from within the pump.

5. In a lift pump, the combination with a valved piston reciprocable therein, a stop on the piston to limit the opening movement of the valve, means to permit an additional movement of the piston at one end of its stroke, an admission valve for the pump spaced from the piston but movable parallel therewith, a lever of the first order normally ineffective but adapted to be interposed between the valve in the piston and the admission valve and operated by engagement with the piston valve when the piston is moved an additional distance to raise both of said valves.

6. In a flow-back release mechanism for pumps, the combination with a piston having a valved opening therethrough, a valve for said opening with a stem extending below the piston, an inlet valve for the pump, a lever normally ineffective but -operable to open the inlet valve when the valve in the piston is opened at the end of its stroke by engagement with the lever, and means to cause the piston valve stem to engage the lever at the end of the stroke of the piston.

7. In a flow-back release mechanism for pumps, the combination with a member having an inlet opening, and inwardly opening valve therefor, a pivoted lever havingprojections with shoulders therein, and a dog to engage the valve pivotally connected to the lever with shoulders to engage the shoulders of the said lever, whereby the rotation of the dog is permitted in one direction and the dog engages the valve to open-it in the other direction.

8. In a flow-back release device for pumps, the combination with a chambered member, an inlet opening therein, a valve for said opening having an inwardly extending valve stem, a second opening in said member in the wall opposite the first named opening, and having an inner shoulder therein, a guide for said valve stem disposed in said second opening against the shoulder, a cap to bind the guard in position, and al lever having means to engage the valve stem and to permit the valve to be bodily removed from the second opening.

9. A flow-back release mechanism for pumps, comprising a valve piston with the stem of the valve extending through' the piston, a pivoted lever adapted to be engaged at one end by the said valve stem when the piston is given an additional movement, means to permit the said additional movement of the piston, an inlet valve piston having a stem extending below the y piston, means Without the pump for effect- 1ng an additional movementat the lower end `of its stroke beyond the ordinary length Aof stroke, and a ow-back release mechanism actuated by the additional movement of the piston comprising a valve spaced from the piston, a lever normally ineffective but havingone arm to engage the release valve, and another arm to engage the piston valve to open the piston valve when the piston is moved an additional distance. v.

11. Thecombination with a pump, having a valved piston therein, a piston rod secured thereto, a flow-back release mechanism, the said piston being ineffective to engage the said mechanism during the normal operation of saidpump, means to effect an additional movement of this piston whereby the said mechanism may be operated at any desired time, comprising a member secured to the piston rod having a projection therefrom, means to reciprocate the piston and piston'rod, an adjustable stop for determining the lengthof stroke of the piston, selective means to position the said stop 'whereby the length of stroke of the piston may be determined and an additional movement thereof obtained, and a dial to indicate the .position of said stop.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 30th day of October, A. D. 1912.

ALLEN A. BOWSER.

lVitnesses:

J. R. MATLACK, L. W. THOMAS. 

